v86vdm.c File Reference

#include <ntoskrnl.h>
#include <debug.h>

Include dependency graph for v86vdm.c:

Go to the source code of this file.

Macros
#define	NDEBUG
#define	KiVdmGetInstructionSize(x)   ((x) & 0xFF)
#define	KiVdmGetPrefixFlags(x)   ((x) & 0xFFFFFF00)

Functions
	KiVdmUnhandledOpcode (F)
	KiVdmUnhandledOpcode (OUTSW)
	KiVdmUnhandledOpcode (OUTSB)
	KiVdmUnhandledOpcode (INSB)
	KiVdmUnhandledOpcode (INSW)
	KiVdmUnhandledOpcode (NPX)
	KiVdmUnhandledOpcode (INBimm)
	KiVdmUnhandledOpcode (INWimm)
	KiVdmUnhandledOpcode (OUTBimm)
	KiVdmUnhandledOpcode (OUTWimm)
	KiVdmUnhandledOpcode (INB)
	KiVdmUnhandledOpcode (INW)
	KiVdmUnhandledOpcode (OUTB)
	KiVdmUnhandledOpcode (OUTW)
	KiVdmUnhandledOpcode (HLT)
	KiVdmUnhandledOpcode (INTO)
	KiVdmUnhandledOpcode (INV)
BOOLEAN FASTCALL	KiVdmOpcodePUSHF (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmOpcodePOPF (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmOpcodeINTnn (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmOpcodeIRET (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmOpcodeCLI (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmOpcodeSTI (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmHandleOpcode (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	KiVdmOpcodePrefix (IN PKTRAP_FRAME TrapFrame, IN ULONG Flags)
BOOLEAN FASTCALL	Ki386HandleOpcodeV86 (IN PKTRAP_FRAME TrapFrame)
ULONG_PTR FASTCALL	KiExitV86Mode (IN PKTRAP_FRAME TrapFrame)
VOID FASTCALL	KiEnterV86Mode (IN ULONG_PTR StackFrameUnaligned)
VOID NTAPI	Ke386SetIOPL (VOID)
NTSTATUS NTAPI	Ke386CallBios (IN ULONG Int, OUT PCONTEXT Context)
BOOLEAN NTAPI	Ke386IoSetAccessProcess (IN PKPROCESS Process, IN ULONG MapNumber)
BOOLEAN NTAPI	Ke386SetIoAccessMap (IN ULONG MapNumber, IN PKIO_ACCESS_MAP IopmBuffer)
BOOLEAN NTAPI	Ke386QueryIoAccessMap (IN ULONG MapNumber, IN PKIO_ACCESS_MAP IopmBuffer)

Variables
ULONG	KeI386EFlagsAndMaskV86 = EFLAGS_USER_SANITIZE
ULONG	KeI386EFlagsOrMaskV86 = EFLAGS_INTERRUPT_MASK
PVOID	Ki386IopmSaveArea
BOOLEAN	KeI386VirtualIntExtensions = FALSE
const PULONG	KiNtVdmState = (PULONG)FIXED_NTVDMSTATE_LINEAR_PC_AT

Macro Definition Documentation

KiVdmGetInstructionSize

#define KiVdmGetInstructionSize

(

x

)

((x) & 0xFF)

Definition at line 16 of file v86vdm.c.

KiVdmGetPrefixFlags

#define KiVdmGetPrefixFlags

(

x

)

((x) & 0xFFFFFF00)

Definition at line 17 of file v86vdm.c.

NDEBUG

#define NDEBUG

Definition at line 13 of file v86vdm.c.

Function Documentation

Ke386CallBios()

NTSTATUS NTAPI Ke386CallBios	(	IN ULONG	Int,
		OUT PCONTEXT	Context
	)

Definition at line 614 of file v86vdm.c.

{
    PUCHAR Trampoline = (PUCHAR)TRAMPOLINE_BASE;
    PTEB VdmTeb = (PTEB)TRAMPOLINE_TEB;
    PVDM_TIB VdmTib = (PVDM_TIB)TRAMPOLINE_TIB;
    ULONG ContextSize = FIELD_OFFSET(CONTEXT, ExtendedRegisters);
    PKTHREAD Thread = KeGetCurrentThread();
    PKTSS Tss = KeGetPcr()->TSS;
    PKPROCESS Process = Thread->ApcState.Process;
    PVDM_PROCESS_OBJECTS VdmProcessObjects;
    USHORT OldOffset, OldBase;
 
    /* Start with a clean TEB */
    RtlZeroMemory(VdmTeb, sizeof(TEB));
 
    /* Write the interrupt and bop */
    *Trampoline++ = 0xCD;
    *Trampoline++ = (UCHAR)Int;
    *(PULONG)Trampoline = TRAMPOLINE_BOP;
 
    /* Setup the VDM TEB and TIB */
    VdmTeb->Vdm = (PVOID)TRAMPOLINE_TIB;
    RtlZeroMemory(VdmTib, sizeof(VDM_TIB));
    VdmTib->Size = sizeof(VDM_TIB);
 
    /* Set a blank VDM state */
    *VdmState = 0;
 
    /* Copy the context */
    RtlCopyMemory(&VdmTib->VdmContext, Context, ContextSize);
    VdmTib->VdmContext.SegCs = (ULONG_PTR)Trampoline >> 4;
    VdmTib->VdmContext.SegSs = (ULONG_PTR)Trampoline >> 4;
    VdmTib->VdmContext.Eip = 0;
    VdmTib->VdmContext.Esp = 2 * PAGE_SIZE - sizeof(ULONG_PTR);
    VdmTib->VdmContext.EFlags |= EFLAGS_V86_MASK | EFLAGS_INTERRUPT_MASK;
    VdmTib->VdmContext.ContextFlags = CONTEXT_FULL;
 
    /* This can't be a real VDM process */
    ASSERT(PsGetCurrentProcess()->VdmObjects == NULL);
 
    /* Allocate VDM structure */
    VdmProcessObjects = ExAllocatePoolWithTag(NonPagedPool,
                                              sizeof(VDM_PROCESS_OBJECTS),
                                              TAG_KERNEL);
    if (!VdmProcessObjects) return STATUS_NO_MEMORY;
 
    /* Set it up */
    RtlZeroMemory(VdmProcessObjects, sizeof(VDM_PROCESS_OBJECTS));
    VdmProcessObjects->VdmTib = VdmTib;
    PsGetCurrentProcess()->VdmObjects = VdmProcessObjects;
 
    /* Set the system affinity for the current thread */
    KeSetSystemAffinityThread(1);
 
    /* Make sure there's space for two IOPMs, then copy & clear the current */
    ASSERT(((PKIPCR)KeGetPcr())->GDT[KGDT_TSS / 8].LimitLow >=
            (0x2000 + IOPM_OFFSET - 1));
    RtlCopyMemory(Ki386IopmSaveArea, &Tss->IoMaps[0].IoMap, IOPM_SIZE);
    RtlZeroMemory(&Tss->IoMaps[0].IoMap, IOPM_SIZE);
 
    /* Save the old offset and base, and set the new ones */
    OldOffset = Process->IopmOffset;
    OldBase = Tss->IoMapBase;
    Process->IopmOffset = (USHORT)IOPM_OFFSET;
    Tss->IoMapBase = (USHORT)IOPM_OFFSET;
 
    /* Switch stacks and work the magic */
    Ki386SetupAndExitToV86Mode(VdmTeb);
 
    /* Restore IOPM */
    RtlCopyMemory(&Tss->IoMaps[0].IoMap, Ki386IopmSaveArea, IOPM_SIZE);
    Process->IopmOffset = OldOffset;
    Tss->IoMapBase = OldBase;
 
    /* Restore affinity */
    KeRevertToUserAffinityThread();
 
    /* Restore context */
    RtlCopyMemory(Context, &VdmTib->VdmContext, ContextSize);
    Context->ContextFlags = CONTEXT_FULL;
 
    /* Free VDM objects */
    ExFreePoolWithTag(PsGetCurrentProcess()->VdmObjects, TAG_KERNEL);
    PsGetCurrentProcess()->VdmObjects = NULL;
 
    /* Return status */
    return STATUS_SUCCESS;
}

Referenced by IntInt10CallBios().

Ke386IoSetAccessProcess()

BOOLEAN NTAPI Ke386IoSetAccessProcess	(	IN PKPROCESS	Process,
		IN ULONG	MapNumber
	)

Definition at line 709 of file v86vdm.c.

{
    USHORT MapOffset;
    PKPRCB Prcb;
    KAFFINITY TargetProcessors;
 
    if(MapNumber > IOPM_COUNT)
        return FALSE;
 
    MapOffset = KiComputeIopmOffset(MapNumber);
 
    Process->IopmOffset = MapOffset;
 
    TargetProcessors = Process->ActiveProcessors;
    Prcb = KeGetCurrentPrcb();
    if (TargetProcessors & Prcb->SetMember)
        KeGetPcr()->TSS->IoMapBase = MapOffset;
 
    return TRUE;
}

Ke386QueryIoAccessMap()

BOOLEAN NTAPI Ke386QueryIoAccessMap	(	IN ULONG	MapNumber,
		IN PKIO_ACCESS_MAP	IopmBuffer
	)

Definition at line 762 of file v86vdm.c.

{
    ULONG i;
    PVOID Map;
    PUCHAR p;
 
    if (MapNumber > IOPM_COUNT)
        return FALSE;
 
    if (MapNumber == IO_ACCESS_MAP_NONE)
    {
        // no access, simply return a map of all 1s
        p = (PUCHAR)IopmBuffer;
        for (i = 0; i < IOPM_SIZE; i++) {
            p[i] = (UCHAR)-1;
        }
    }
    else
    {
        // copy the bits
        Map = (PVOID)&(KeGetPcr()->TSS->IoMaps[MapNumber-1].IoMap);
        RtlMoveMemory((PVOID)IopmBuffer, Map, IOPM_SIZE);
    }
 
    return TRUE;
}

Ke386SetIoAccessMap()

BOOLEAN NTAPI Ke386SetIoAccessMap	(	IN ULONG	MapNumber,
		IN PKIO_ACCESS_MAP	IopmBuffer
	)

Definition at line 736 of file v86vdm.c.

{
    PKPROCESS CurrentProcess;
    PKPRCB Prcb;
    PVOID pt;
 
    if ((MapNumber > IOPM_COUNT) || (MapNumber == IO_ACCESS_MAP_NONE))
        return FALSE;
 
    Prcb = KeGetCurrentPrcb();
 
    // Copy the IOP map and load the map for the current process.
    pt = &(KeGetPcr()->TSS->IoMaps[MapNumber-1].IoMap);
    RtlMoveMemory(pt, (PVOID)IopmBuffer, IOPM_SIZE);
    CurrentProcess = Prcb->CurrentThread->ApcState.Process;
    KeGetPcr()->TSS->IoMapBase = CurrentProcess->IopmOffset;
 
    return TRUE;
}

Ke386SetIOPL()

VOID NTAPI Ke386SetIOPL

(

VOID

)

Definition at line 581 of file v86vdm.c.

{
 
    PKTHREAD Thread = KeGetCurrentThread();
    PKPROCESS Process = Thread->ApcState.Process;
    PKTRAP_FRAME TrapFrame;
    CONTEXT Context;
 
    /* IOPL was enabled for this process/thread */
    Process->Iopl = TRUE;
    Thread->Iopl = TRUE;
 
    /* Get the trap frame on exit */
    TrapFrame = KeGetTrapFrame(Thread);
 
    /* Convert to a context */
    Context.ContextFlags = CONTEXT_CONTROL;
    KeTrapFrameToContext(TrapFrame, NULL, &Context);
 
    /* Set the IOPL flag */
    Context.EFlags |= EFLAGS_IOPL;
 
    /* Convert back to a trap frame */
    KeContextToTrapFrame(&Context, NULL, TrapFrame, CONTEXT_CONTROL, UserMode);
}

Referenced by NtSetInformationProcess().

Ki386HandleOpcodeV86()

BOOLEAN FASTCALL Ki386HandleOpcodeV86

(

IN PKTRAP_FRAME

TrapFrame

)

Definition at line 456 of file v86vdm.c.

{
    /* Clean up */
    TrapFrame->Eip &= 0xFFFF;
    TrapFrame->HardwareEsp &= 0xFFFF;
 
    /* We start with only 1 byte per instruction */
    return KiVdmHandleOpcode(TrapFrame, 1);
}

Referenced by KiTrap0DHandler().

KiEnterV86Mode()

VOID FASTCALL KiEnterV86Mode

(

IN ULONG_PTR

StackFrameUnaligned

)

Definition at line 507 of file v86vdm.c.

{
    PKTHREAD Thread;
    PKV8086_STACK_FRAME StackFrame = (PKV8086_STACK_FRAME)(ROUND_UP(StackFrameUnaligned - 4, 16) + 4);
    PKTRAP_FRAME TrapFrame = &StackFrame->TrapFrame;
    PKV86_FRAME V86Frame = &StackFrame->V86Frame;
    PFX_SAVE_AREA NpxFrame = &StackFrame->NpxArea;
 
    ASSERT((ULONG_PTR)NpxFrame % 16 == 0);
 
    /* Build fake user-mode trap frame */
    TrapFrame->SegCs = KGDT_R0_CODE | RPL_MASK;
    TrapFrame->SegEs = TrapFrame->SegDs = TrapFrame->SegFs = TrapFrame->SegGs = 0;
    TrapFrame->ErrCode = 0;
 
    /* Get the current thread's initial stack */
    Thread = KeGetCurrentThread();
    V86Frame->ThreadStack = KiGetThreadNpxArea(Thread);
 
    /* Save TEB addresses */
    V86Frame->ThreadTeb = Thread->Teb;
    V86Frame->PcrTeb = KeGetPcr()->NtTib.Self;
 
    /* Save return EIP */
    TrapFrame->Eip = (ULONG_PTR)Ki386BiosCallReturnAddress;
 
    /* Save our stack (after the frames) */
    TrapFrame->Esi = StackFrameUnaligned;
    TrapFrame->Edi = (ULONG_PTR)_AddressOfReturnAddress() + 4;
 
    /* Sanitize EFlags and enable interrupts */
    TrapFrame->EFlags = __readeflags() & 0x60DD7;
    TrapFrame->EFlags |= EFLAGS_INTERRUPT_MASK;
 
    /* Fill out the rest of the frame */
    TrapFrame->HardwareSegSs = KGDT_R3_DATA | RPL_MASK;
    TrapFrame->HardwareEsp = 0x11FFE;
    TrapFrame->ExceptionList = EXCEPTION_CHAIN_END;
    TrapFrame->Dr7 = 0;
 
    /* Set some debug fields if trap debugging is enabled */
    KiFillTrapFrameDebug(TrapFrame);
 
    /* Disable interrupts */
    _disable();
 
    /* Copy the thread's NPX frame */
    RtlCopyMemory(NpxFrame, V86Frame->ThreadStack, sizeof(FX_SAVE_AREA));
 
    /* Clear exception list */
    KeGetPcr()->NtTib.ExceptionList = EXCEPTION_CHAIN_END;
 
    /* Set new ESP0 */
    KeGetPcr()->TSS->Esp0 = (ULONG_PTR)&TrapFrame->V86Es;
 
    /* Set new initial stack */
    Thread->InitialStack = V86Frame;
 
    /* Set VDM TEB */
    Thread->Teb = (PTEB)TRAMPOLINE_TEB;
    KiSetTebBase(KeGetPcr(), (PVOID)TRAMPOLINE_TEB);
 
    /* Enable interrupts */
    _enable();
 
    /* Start VDM execution */
    NtVdmControl(VdmStartExecution, NULL);
 
    /* Exit to V86 mode */
    KiEoiHelper(TrapFrame);
}

KiExitV86Mode()

ULONG_PTR FASTCALL KiExitV86Mode

(

IN PKTRAP_FRAME

TrapFrame

)

Definition at line 468 of file v86vdm.c.

{
    PKPCR Pcr = KeGetPcr();
    ULONG_PTR StackFrameUnaligned;
    PKV8086_STACK_FRAME StackFrame;
    PKTHREAD Thread;
    PKV86_FRAME V86Frame;
    PFX_SAVE_AREA NpxFrame;
 
    /* Get the stack frame back */
    StackFrameUnaligned = TrapFrame->Esi;
    StackFrame = (PKV8086_STACK_FRAME)(ROUND_UP(StackFrameUnaligned - 4, 16) + 4);
    V86Frame = &StackFrame->V86Frame;
    NpxFrame = &StackFrame->NpxArea;
    ASSERT((ULONG_PTR)NpxFrame % 16 == 0);
 
    /* Copy the FPU frame back */
    Thread = KeGetCurrentThread();
    RtlCopyMemory(KiGetThreadNpxArea(Thread), NpxFrame, sizeof(FX_SAVE_AREA));
 
    /* Set initial stack back */
    Thread->InitialStack = (PVOID)((ULONG_PTR)V86Frame->ThreadStack + sizeof(FX_SAVE_AREA));
 
    /* Set ESP0 back in the KTSS */
    Pcr->TSS->Esp0 = (ULONG_PTR)Thread->InitialStack;
    Pcr->TSS->Esp0 -= sizeof(KTRAP_FRAME) - FIELD_OFFSET(KTRAP_FRAME, V86Es);
    Pcr->TSS->Esp0 -= NPX_FRAME_LENGTH;
 
    /* Restore TEB addresses */
    Thread->Teb = V86Frame->ThreadTeb;
    KiSetTebBase(KeGetPcr(), V86Frame->ThreadTeb);
 
    /* Enable interrupts and return a pointer to the trap frame */
    _enable();
    return StackFrameUnaligned;
}

KiVdmHandleOpcode()

BOOLEAN FASTCALL KiVdmHandleOpcode	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 379 of file v86vdm.c.

{
    ULONG Eip;
 
    /* Get flat EIP of the *current* instruction (not the original EIP) */
    Eip = (TrapFrame->SegCs << 4) + TrapFrame->Eip;
    Eip += KiVdmGetInstructionSize(Flags) - 1;
 
    /* Read the opcode entry */
    switch (*(PUCHAR)Eip)
    {
        case 0xF:               return KiCallVdmHandler(F);
        case 0x26:              return KiCallVdmPrefixHandler(PFX_FLAG_ES);
        case 0x2E:              return KiCallVdmPrefixHandler(PFX_FLAG_CS);
        case 0x36:              return KiCallVdmPrefixHandler(PFX_FLAG_SS);
        case 0x3E:              return KiCallVdmPrefixHandler(PFX_FLAG_DS);
        case 0x64:              return KiCallVdmPrefixHandler(PFX_FLAG_FS);
        case 0x65:              return KiCallVdmPrefixHandler(PFX_FLAG_GS);
        case 0x66:              return KiCallVdmPrefixHandler(PFX_FLAG_OPER32);
        case 0x67:              return KiCallVdmPrefixHandler(PFX_FLAG_ADDR32);
        case 0xF0:              return KiCallVdmPrefixHandler(PFX_FLAG_LOCK);
        case 0xF2:              return KiCallVdmPrefixHandler(PFX_FLAG_REPNE);
        case 0xF3:              return KiCallVdmPrefixHandler(PFX_FLAG_REP);
        case 0x6C:              return KiCallVdmHandler(INSB);
        case 0x6D:              return KiCallVdmHandler(INSW);
        case 0x6E:              return KiCallVdmHandler(OUTSB);
        case 0x6F:              return KiCallVdmHandler(OUTSW);
        case 0x98:              return KiCallVdmHandler(NPX);
        case 0xD8:              return KiCallVdmHandler(NPX);
        case 0xD9:              return KiCallVdmHandler(NPX);
        case 0xDA:              return KiCallVdmHandler(NPX);
        case 0xDB:              return KiCallVdmHandler(NPX);
        case 0xDC:              return KiCallVdmHandler(NPX);
        case 0xDD:              return KiCallVdmHandler(NPX);
        case 0xDE:              return KiCallVdmHandler(NPX);
        case 0xDF:              return KiCallVdmHandler(NPX);
        case 0x9C:              return KiCallVdmHandler(PUSHF);
        case 0x9D:              return KiCallVdmHandler(POPF);
        case 0xCD:              return KiCallVdmHandler(INTnn);
        case 0xCE:              return KiCallVdmHandler(INTO);
        case 0xCF:              return KiCallVdmHandler(IRET);
        case 0xE4:              return KiCallVdmHandler(INBimm);
        case 0xE5:              return KiCallVdmHandler(INWimm);
        case 0xE6:              return KiCallVdmHandler(OUTBimm);
        case 0xE7:              return KiCallVdmHandler(OUTWimm);
        case 0xEC:              return KiCallVdmHandler(INB);
        case 0xED:              return KiCallVdmHandler(INW);
        case 0xEE:              return KiCallVdmHandler(OUTB);
        case 0xEF:              return KiCallVdmHandler(OUTW);
        case 0xF4:              return KiCallVdmHandler(HLT);
        case 0xFA:              return KiCallVdmHandler(CLI);
        case 0xFB:              return KiCallVdmHandler(STI);
        default:
            DPRINT1("Unhandled instruction: 0x%02x.\n", *(PUCHAR)Eip);
            return KiCallVdmHandler(INV);
    }
}

Referenced by Ki386HandleOpcodeV86(), and KiVdmOpcodePrefix().

KiVdmOpcodeCLI()

BOOLEAN FASTCALL KiVdmOpcodeCLI	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 341 of file v86vdm.c.

{
    /* Check for VME support */
    ASSERT(KeI386VirtualIntExtensions == FALSE);
 
    /* Disable interrupts */
    KiVdmClearVdmEFlags(EFLAGS_INTERRUPT_MASK);
 
    /* Skip instruction */
    TrapFrame->Eip += KiVdmGetInstructionSize(Flags);
 
    /* Done */
    return TRUE;
}

KiVdmOpcodeINTnn()

BOOLEAN FASTCALL KiVdmOpcodeINTnn	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 178 of file v86vdm.c.

{
    ULONG Esp, V86EFlags, TrapEFlags, Eip, Interrupt;
 
    /* Read trap frame EFlags */
    TrapEFlags = TrapFrame->EFlags;
 
    /* Remove interrupt flag from V8086 EFlags */
    V86EFlags = *KiNtVdmState;
    KiVdmClearVdmEFlags(EFLAGS_INTERRUPT_MASK);
 
    /* Keep only alignment and interrupt flag from the V8086 state */
    V86EFlags &= (EFLAGS_ALIGN_CHECK | EFLAGS_INTERRUPT_MASK);
 
    /* Check for VME support */
    ASSERT(KeI386VirtualIntExtensions == FALSE);
 
    /* Mask in the relevant V86 EFlags into the trap flags */
    V86EFlags |= (TrapEFlags & ~EFLAGS_INTERRUPT_MASK);
 
    /* And mask out the VIF, nested task and TF flag from the trap flags */
    TrapFrame->EFlags = TrapEFlags &~ (EFLAGS_VIF | EFLAGS_NESTED_TASK | EFLAGS_TF);
 
    /* Add the IOPL flag to the local trap flags */
    V86EFlags |= EFLAGS_IOPL;
 
    /* Build flat ESP */
    Esp = (TrapFrame->HardwareSegSs << 4) + TrapFrame->HardwareEsp;
 
    /* Push EFlags */
    Esp -= 2;
    *(PUSHORT)(Esp) = (USHORT)V86EFlags;
 
    /* Push CS */
    Esp -= 2;
    *(PUSHORT)(Esp) = (USHORT)TrapFrame->SegCs;
 
    /* Push IP */
    Esp -= 2;
    *(PUSHORT)(Esp) = (USHORT)TrapFrame->Eip + KiVdmGetInstructionSize(Flags) + 1;
 
    /* Update ESP */
    TrapFrame->HardwareEsp = (USHORT)Esp;
 
    /* Get flat EIP */
    Eip = (TrapFrame->SegCs << 4) + TrapFrame->Eip;
 
    /* Now get the *next* EIP address (current is original + the count - 1) */
    Eip += KiVdmGetInstructionSize(Flags);
 
    /* Now read the interrupt number */
    Interrupt = *(PUCHAR)Eip;
 
    /* Read the EIP from its IVT entry */
    Interrupt = *(PULONG)(Interrupt * 4);
    TrapFrame->Eip = (USHORT)Interrupt;
 
    /* Now get the CS segment */
    Interrupt = (USHORT)(Interrupt >> 16);
 
    /* Check if the trap was not V8086 trap */
    if (!(TrapFrame->EFlags & EFLAGS_V86_MASK))
    {
        /* Was it a kernel CS? */
        Interrupt |= RPL_MASK;
        if (TrapFrame->SegCs == KGDT_R0_CODE)
        {
            /* Add the RPL mask */
            TrapFrame->SegCs = Interrupt;
        }
        else
        {
            /* Set user CS */
            TrapFrame->SegCs = KGDT_R3_CODE | RPL_MASK;
        }
    }
    else
    {
        /* Set IVT CS */
        TrapFrame->SegCs = Interrupt;
    }
 
    /* We're done */
    return TRUE;
}

KiVdmOpcodeIRET()

BOOLEAN FASTCALL KiVdmOpcodeIRET	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 267 of file v86vdm.c.

{
    ULONG Esp, V86EFlags, EFlags, TrapEFlags, Eip;
 
    /* Build flat ESP */
    Esp = (TrapFrame->HardwareSegSs << 4) + TrapFrame->HardwareEsp;
 
    /* Check for OPER32 */
    if (KiVdmGetPrefixFlags(Flags) & PFX_FLAG_OPER32)
    {
        /* Build segmented EIP */
        TrapFrame->Eip = *(PULONG)Esp;
        TrapFrame->SegCs = *(PUSHORT)(Esp + 4);
 
        /* Set new ESP */
        TrapFrame->HardwareEsp += 12;
 
        /* Get EFLAGS */
        EFlags = *(PULONG)(Esp + 8);
    }
    else
    {
        /* Build segmented EIP */
        TrapFrame->Eip = *(PUSHORT)Esp;
        TrapFrame->SegCs = *(PUSHORT)(Esp + 2);
 
        /* Set new ESP */
        TrapFrame->HardwareEsp += 6;
 
        /* Get EFLAGS */
        EFlags = *(PUSHORT)(Esp + 4);
    }
 
    /* Mask out EFlags */
    EFlags &= ~(EFLAGS_IOPL + EFLAGS_VIF + EFLAGS_NESTED_TASK + EFLAGS_VIP);
    V86EFlags = EFlags;
 
    /* Check for VME support */
    ASSERT(KeI386VirtualIntExtensions == FALSE);
 
    /* Add V86 and Interrupt flag */
    EFlags |= EFLAGS_V86_MASK | EFLAGS_INTERRUPT_MASK;
 
    /* Update EFlags in trap frame */
    TrapEFlags = TrapFrame->EFlags;
    TrapFrame->EFlags = (TrapFrame->EFlags & EFLAGS_VIP) | EFlags;
 
    /* Check if ESP0 needs to be fixed up */
    if (!(TrapEFlags & EFLAGS_V86_MASK)) Ki386AdjustEsp0(TrapFrame);
 
    /* Update the V8086 EFlags state */
    KiVdmClearVdmEFlags(EFLAGS_INTERRUPT_MASK);
    KiVdmSetVdmEFlags(V86EFlags);
 
    /* Build flat EIP and check if this is the BOP instruction */
    Eip = (TrapFrame->SegCs << 4) + TrapFrame->Eip;
    if (*(PUSHORT)Eip == 0xC4C4)
    {
        /* Dispatch the BOP */
        VdmDispatchBop(TrapFrame);
    }
    else
    {
        /* FIXME: Check for VDM interrupts */
       DPRINT("FIXME: Check for VDM interrupts\n");
    }
 
    /* We're done */
    return TRUE;
}

KiVdmOpcodePOPF()

BOOLEAN FASTCALL KiVdmOpcodePOPF	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 104 of file v86vdm.c.

{
    ULONG Esp, V86EFlags, EFlags, TrapEFlags;
 
    /* Build flat ESP */
    Esp = (TrapFrame->HardwareSegSs << 4) + (USHORT)TrapFrame->HardwareEsp;
 
    /* Check for OPER32 */
    if (KiVdmGetPrefixFlags(Flags) & PFX_FLAG_OPER32)
    {
        /* Read EFlags */
        EFlags = *(PULONG)Esp;
        Esp += 4;
    }
    else
    {
        /* Read EFlags */
        EFlags = *(PUSHORT)Esp;
        Esp += 2;
    }
 
    /* Set new ESP */
    TrapFrame->HardwareEsp = Esp - (TrapFrame->HardwareSegSs << 4);
 
    /* Mask out IOPL from the flags */
    EFlags &= ~EFLAGS_IOPL;
 
    /* Save the V86 flags, but mask out the nested task flag */
    V86EFlags = EFlags & ~EFLAGS_NESTED_TASK;
 
    /* Now leave only alignment, nested task and interrupt flag */
    EFlags &= (EFLAGS_ALIGN_CHECK | EFLAGS_NESTED_TASK | EFLAGS_INTERRUPT_MASK);
 
    /* Get trap EFlags */
    TrapEFlags = TrapFrame->EFlags;
 
    /* Check for VME support */
    if(KeI386VirtualIntExtensions)
    {
        /* Copy the IF flag into the VIF one */
        V86EFlags &= ~EFLAGS_VIF;
        if(V86EFlags & EFLAGS_INTERRUPT_MASK)
        {
            V86EFlags |= EFLAGS_VIF;
            /* Don't set the interrupt flag */
            V86EFlags &= ~EFLAGS_INTERRUPT_MASK;
        }
    }
 
    /* Add V86 flag */
    V86EFlags |= EFLAGS_V86_MASK;
 
    /* Update EFlags in trap frame */
    TrapFrame->EFlags |= V86EFlags;
 
    /* Check if ESP0 needs to be fixed up */
    if (TrapEFlags & EFLAGS_V86_MASK) Ki386AdjustEsp0(TrapFrame);
 
    /* Update the V8086 EFlags state */
    KiVdmClearVdmEFlags(EFLAGS_ALIGN_CHECK | EFLAGS_NESTED_TASK | EFLAGS_INTERRUPT_MASK);
    KiVdmSetVdmEFlags(EFlags);
 
    /* FIXME: Check for VDM interrupts */
 
    /* Update EIP */
    TrapFrame->Eip += KiVdmGetInstructionSize(Flags);
 
    /* We're done */
    return TRUE;
}

KiVdmOpcodePrefix()

BOOLEAN FASTCALL KiVdmOpcodePrefix	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 442 of file v86vdm.c.

{
    /* Increase instruction size */
    Flags++;
 
    /* Handle the next opcode */
    return KiVdmHandleOpcode(TrapFrame, Flags);
}

KiVdmOpcodePUSHF()

BOOLEAN FASTCALL KiVdmOpcodePUSHF	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 51 of file v86vdm.c.

{
    ULONG Esp, V86EFlags, TrapEFlags;
 
    /* Get current V8086 flags and mask out interrupt flag */
    V86EFlags = *KiNtVdmState;
    V86EFlags &= ~EFLAGS_INTERRUPT_MASK;
 
    /* Get trap frame EFLags */
    TrapEFlags = TrapFrame->EFlags;
    /* Check for VME support */
    if(KeI386VirtualIntExtensions)
    {
        /* Copy the virtual interrupt flag to the interrupt flag */
        TrapEFlags &= ~EFLAGS_INTERRUPT_MASK;
        if(TrapEFlags & EFLAGS_VIF)
            TrapEFlags |= EFLAGS_INTERRUPT_MASK;
    }
    /* Leave only align, nested task and interrupt */
    TrapEFlags &= (EFLAGS_ALIGN_CHECK | EFLAGS_NESTED_TASK | EFLAGS_INTERRUPT_MASK);
 
    /* Add in those flags if they exist, and add in the IOPL flag */
    V86EFlags |= TrapEFlags;
    V86EFlags |= EFLAGS_IOPL;
 
    /* Build flat ESP */
    Esp = (TrapFrame->HardwareSegSs << 4) + (USHORT)TrapFrame->HardwareEsp;
 
    /* Check for OPER32 */
    if (KiVdmGetPrefixFlags(Flags) & PFX_FLAG_OPER32)
    {
        /* Save EFlags */
        Esp -= 4;
        *(PULONG)Esp = V86EFlags;
    }
    else
    {
        /* Save EFLags */
        Esp -= 2;
        *(PUSHORT)Esp = (USHORT)V86EFlags;
    }
 
    /* Set new ESP and EIP */
    TrapFrame->HardwareEsp = Esp - (TrapFrame->HardwareSegSs << 4);
    TrapFrame->Eip += KiVdmGetInstructionSize(Flags);
 
    /* We're done */
    return TRUE;
}

KiVdmOpcodeSTI()

BOOLEAN FASTCALL KiVdmOpcodeSTI	(	IN PKTRAP_FRAME	TrapFrame,
		IN ULONG	Flags
	)

Definition at line 359 of file v86vdm.c.

{
    /* Check for VME support */
    ASSERT(KeI386VirtualIntExtensions == FALSE);
 
    /* Enable interrupts */
    KiVdmSetVdmEFlags(EFLAGS_INTERRUPT_MASK);
 
    /* Skip instruction */
    TrapFrame->Eip += KiVdmGetInstructionSize(Flags);
 
    /* Done */
    return TRUE;
}

KiVdmUnhandledOpcode() [1/17]

KiVdmUnhandledOpcode

(

F

)

KiVdmUnhandledOpcode() [2/17]

KiVdmUnhandledOpcode

(

HLT

)

KiVdmUnhandledOpcode() [3/17]

KiVdmUnhandledOpcode

(

INB

)

KiVdmUnhandledOpcode() [4/17]

KiVdmUnhandledOpcode

(

INBimm

)

KiVdmUnhandledOpcode() [5/17]

KiVdmUnhandledOpcode

(

INSB

)

KiVdmUnhandledOpcode() [6/17]

KiVdmUnhandledOpcode

(

INSW

)

KiVdmUnhandledOpcode() [7/17]

KiVdmUnhandledOpcode

(

INTO

)

KiVdmUnhandledOpcode() [8/17]

KiVdmUnhandledOpcode

(

INV

)

KiVdmUnhandledOpcode() [9/17]

KiVdmUnhandledOpcode

(

INW

)

KiVdmUnhandledOpcode() [10/17]

KiVdmUnhandledOpcode

(

INWimm

)

KiVdmUnhandledOpcode() [11/17]

KiVdmUnhandledOpcode

(

NPX

)

KiVdmUnhandledOpcode() [12/17]

KiVdmUnhandledOpcode

(

OUTB

)

KiVdmUnhandledOpcode() [13/17]

KiVdmUnhandledOpcode

(

OUTBimm

)

KiVdmUnhandledOpcode() [14/17]

KiVdmUnhandledOpcode

(

OUTSB

)

KiVdmUnhandledOpcode() [15/17]

KiVdmUnhandledOpcode

(

OUTSW

)

KiVdmUnhandledOpcode() [16/17]

KiVdmUnhandledOpcode

(

OUTW

)

KiVdmUnhandledOpcode() [17/17]

KiVdmUnhandledOpcode

(

OUTWimm

)

Variable Documentation

KeI386EFlagsAndMaskV86

ULONG KeI386EFlagsAndMaskV86 = EFLAGS_USER_SANITIZE

Definition at line 21 of file v86vdm.c.

Referenced by VdmSwapContext().

KeI386EFlagsOrMaskV86

ULONG KeI386EFlagsOrMaskV86 = EFLAGS_INTERRUPT_MASK

Definition at line 22 of file v86vdm.c.

Referenced by VdmSwapContext().

KeI386VirtualIntExtensions

BOOLEAN KeI386VirtualIntExtensions = FALSE

Definition at line 24 of file v86vdm.c.

Referenced by KeI386VdmInitialize(), KiVdmOpcodeCLI(), KiVdmOpcodeINTnn(), KiVdmOpcodeIRET(), KiVdmOpcodePOPF(), KiVdmOpcodePUSHF(), KiVdmOpcodeSTI(), VdmEndExecution(), and VdmpStartExecution().

Ki386IopmSaveArea

PVOID Ki386IopmSaveArea

Definition at line 23 of file v86vdm.c.

Referenced by Ke386CallBios(), and KiInitializeKernel().

KiNtVdmState

const PULONG KiNtVdmState = (PULONG)FIXED_NTVDMSTATE_LINEAR_PC_AT

Definition at line 25 of file v86vdm.c.

Referenced by KiVdmOpcodeINTnn(), and KiVdmOpcodePUSHF().